Pin-puller.



W. A; SMITH;

PINPULLER. APPLICATION FILED SEPT-27,1916.

Patented. Apr. 30, 1918.

WARE.

mam.

To all whom it may conoern. Be it known that 1, WIL IAM citizen of theUnited States, residing f at Denver, in the county ofDenver-and State ofColorado,have invented certaln new and useful Improvements inPin-Pullers, of which the following is a speclficatlon.

As is well known to those skilled intthe art, in the production, repairand sharpen ing of drill bits having openings there through, it is theusual custom to tempo rarily insert a pin in the end of the drill bitbeing operated on in order to maintainthe proper shape of the opening.therefore are apt to become quite tightly wedgedin place, and it is theobiect of the present invention to providemeans whereby the pins can bereadily extracted from the drill bits after the same are completed.

Preferably the device is in the form of an attachment oradjunct to thedrill sharpening machine, but is not necessarily so.

Anembodiment of the invention is illustrated in the accompanyingdrawings, wherein 2- Figure 1 is a front elevation of aportion of thebase of a sharpening machine showing the pin puller thereon.

Fig. 2 is a side elevation of the sameyan'd Fig.3 is, a detail sectionalview substantially on the line 3'3 of Fig. 2.

Fig. 4 is'a detail view showing a portion of a drill bit and a pinthereintobe pulled.

Similar reference numerals designate corresponding parts in all thefigures of the drawlngs.

In the embodiment illustrated the base only of the drill sharpener isshown and is designated 4. Secured to the upper portion thereof is ahorizontal supportingplate or bed 5 having at its frontend an upstandingabutment 6. This abutment has in its front side a recess or socket 7arranged to receive the end of the drill bit, and from the socket runs'rArns WILLIAM A. sivrrrn, or nnnvnnuoononAno, AssIG on 'ro THE DENVERH m ing MANUFACTURING COMPANY, OFDEN'VER, COLORADO, A.CORPORATION:OFJDELA.

These pins rArn PINQ ULLER. 1'

Speci a of EM ..Patented.apra fialtllle.

Appli'cationfil ed se tember27, 191e. enigma-122527.

against the bar and eye, serves to urge said A: SMITH, a

0mm x bar toward 1 the abutment; The? front end I of the "bar 5 isprovided on its upper face with teeth 13. Anotherf'jaw l is located overthe teeth 13, and isprovided on its under face with coacting'teethlatThis j aw is provided with spaced depending-legs 16' that straddlethe-bar 9 and the supports, so

thatthey act as a. guide forthe front end of said bar9. These logs arepivotedto thebar 9 as shown at 17.

Suitably fulcrumed on the'lower portion of the base has shownat18,is atreadle '19,"

and this treadle hasa link connection with one lend-of a bell crank21pivoted,as shown at 22, upon the upper portionof the Thelink 20 passesthrough a guide eye 24:

] secured to" the base" 4 and said eye consti tutes an abutmenthavinglacoiled spring 25' that bears against 'anabutmentoollar 9.6

fixed totherod 20.

It is understood that in using-the aforesaid'pins in the ends of drillbits, they project beyond the same-audit will thus be: evident thatwhen'it is desired to remove these 1 base 4. A link 23 connects the otherarnrof the bell crank with the legs 16'of the j aw '14:.

pins, all that is necessary is" to place the end of the 'drill' bitinthesocket 17 with the end of the pin projecting through the slot 8 andbetweenthefljaws9and"l4. The operator thereupon presses downwardly uponthe treadle 19 and the first resultant action-is the swinging ofthe aw14' down-toward the jaw i9 until theend of thepinisfirmly" graspedtherebetweenf further movement of the 1 treadle causes the two jaws tobe bodily moved rearwardly against the "action of the spring 12, and thepin moving with it, is withdrawn. If thecomplete ;:1-ta1--*vwardmovementof the'jaws is insufficientto completely detach the pin, allthatis necessary is to allow the treadle to be" elevated,

' be apparent to those skilled in the art, without further description,and it will be understood that within the scope of the claims variouschanges in the size, shape, proportion and minor details of constructionmay be resorted to without departing from the spirit or sacrificing anyof the advantages of the invention.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. In apparatus of the character set forth, the combination with aholding device for the drill, of coacting pin grasping jaws movabletoward and from the same, operating means for relatively moving the jawstoward each other tograsp a pin and moving said jawsaway from theabutment to extract the pin from the drill, and means for automaticallyreleasing the jaws from. the pin and returning them toward the abutmentwhen said operatingmeans is released.

2. The combination with a holding device for the drill, of coacting pingrasping jaws movable toward and from the same, operating meansconnected to one of the jaws for relatively moving the jaws toward eachother to grasp a pin and moving said jaws away from the abutment toextract the pin from the drill, and means engaged with the other jaw forautomatically returning said jaws toward the abutment when saidoperating means is released.

3. In apparatus of the character set forth, the combination of a holdingdevice for the drill, of a pin engaging jaw slidable toward and fromsaid device, a spring operating against the jaw to slide it toward theholding device, a jaw pivoted to the first jaw and coacting therewith tograsp a pin introduced between the jaws, and means for swinging thepivoted jaw toward the sliding jaw and causing the movement of the jawsaway from the holding device against the action of the spring, saidmeans when released permitting the automatic opening of the jaws andtheir return toward the abutment by said sprin I 4-. In apparatus of thecharacter set forth, the combination with a supporting bar having anoif-set abutment, of a jaw bar slidable on the supporting bar, aspringbearing against the jaw bar. to urge it toward the abutment, a jawcoacting with the jaw bar and pivoted thereto, said jaw having legsstraddling both bars, operating means connected to the legs for swingingthe jaw and causing its movement with the jaw ha r away from theabutment, and means engaged with the operating means for automaticallyopening the jaw and jaw bar and permitting the return of the same towardthe abutment when the operating means is released.

5. In apparatus of the character set forth, the combination with asupport, of coaeting relatively movable pin grasping jaws that aretogether movable when engaged with a pin, a treadle, a connectionbetween the treadle and one of the jaws for moving one of the samerelatively and also for moving the aws bodily together, and yieldingmeans opposing the movements of the jaws.

6. In apparatus of the character set :l'orth, the combination with asupport, of coacting relatively movable pin grasping jaws that aretogether movable when engaged with a pin, means for thus moving thejaws, a. spring opposing the movement 01' the jaws, and a springopposing the movement of the means.

7. In apparatus of the character set forth, the combination with asupport having an abutment, of a jaw slidable on the support toward andfrom the abutment, a spring for urging the jaw toward the abutment,another and coacting jaw pivoted upon the first jaw, and means connectedto the last mentioned jaw for swinging the same and causing the bodilymovement of both jaws against the action of said spring.

8. In apparatus of the character set forth, the combination with asupport having an offset abutment, of a jaw slidable on the supporttoward and from the abutment, a spring bearing against the jaw i'orurging it toward the abutment, another jaw pivoted to the first aw andcoacting therewith, a. treadle, connections between the treadle and thepivoted jaw, and a spring for causing the pivoted jaw to normallymaintain an open position.

In testimony whereof, I aliix my signature in the presence of twowitnesses.

WILLIAM A. SMITH. Witnesses D. E. STROUT, JAS. R. ELMnNnoRr.

ap!" of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

. Washington, D. C.

